If he stole from you and/or assaulted you, you can make a police report.
In no event you should you deliberately lure him out to meet with you again for the purpose of "catching" him in any of the kinds of acts that you know he engages in. That could be dangerous for you; it could damage on-going criminal investigations; and it could cause anything you learn to be off-limits and not useable in a court proceeding against him. Let the police handle criminal investigations. If the police are interested in him, they will not be thwarted by the fact that he changes his number repeatedly.
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Ms McCall's advice is excellent just considering the personal danger issue alone. Give what you have to the cops. It is up to them to pursue the guy.
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